With Dan Smyers letting his long curly locks fly and Shay Mooney looking svelte in a leather jacket, the two music makers sang the sweet melody that currently finds itself celebrating its fourth week on the top of both the Billboard and Mediabase/Country Aircheck charts.

And yes, that’s historic.

In fact, Dan + Shay are the only country duo to do that in the past five years.

“Thank you to country radio, our fans, our team, our co-writers, our wives and everyone who made it possible for us to celebrate our first four-week No. 1,” the duo shared with fans on their Instagram page on Monday (Jan. 7.)

"What an incredible way to end 2018 and an even better way to start 2019. Everyday we’re living out the movie that we dreamed up our whole lives, and that’s all because of you.”

Also on their Instagram page, the country duo asked for luck from their fans shortly before the late night performance on Fallon.

Of course, things just look to get hotter and hotter over the next few months for these two, as Dan + Shay are not only up for two Grammy Awards for“Best Country Duo/Group Performance” and “Best Country Song,” but they also will travel overseas come Jan. 17 on a headlining UK tour.